Re: IIgs RAM Card Identification

["Bill Garber" <willy46pa@comcast.net>]

"Polymorph" <polymorph69@hotmail.com> wrote in message
1156997305.346605.171410@m73g2000cwd.googlegroups.com">news:1156997305.346605.171410@m73g2000cwd.googlegroups.com...
:
: Mark McDougall wrote:
: > I would imagine it would be quite straightforward to produce a schematic
: > from the PCB given there's only a handful of 74 ICs on the card... that
: > should tell you exactly what the jumpers do and what size DRAM to use.
:
: It might be straightforward for a hardware engineer like yourself,
: however I'm a software guy, so I'm way outta my comfort zone doing
: that.  :-)
:
: cheers,
: -p


Well, seeing how MSIZE (Pin 27) is pulled up to +5v (Pin 24),
that makes it 256K rows, thus a 1 MB card. The showing of 768K
with Jumper #1 connected is still a mystery. If you could supply
me with higher resolution scans of both sides of the card, I can
probably tell you what the deal is.

Bill Garber
Owner - Garberstreet Enterprizez
Co-owner - GSE-Reactive.com
(610)935-7676 (610)329-8996